What does DSB-SC stand for in communication system engineering?

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RRB JE ECE 22 Apr 2025 Shift 2 CBT 2 Official Paper
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  1. Double Sideband with Single Carrier
  2. Double Sideband Suppressed Carrier
  3. Dual Sideband with Single Carrier
  4. Dependent Sideband Suppressed Carrier

Answer (Detailed Solution Below)

Option 2 : Double Sideband Suppressed Carrier
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In communication system engineering, DSB-SC stands for Double Sideband Suppressed Carrier.

Concept:

In a balanced modulator, 2 AM modulators are connected in a way that the resultant signal does not contain the carrier spectrum, i.e. to generate a Double Side-band suppressed carrier (DSB-SC).

Analysis:

The circuit diagram of a balanced modulator is as shown:

The resultant DSB signal is the difference of the two, i.e.

Hence,

The frequency spectrum of the DSB-SC signal:

The standard DSB-SC equation is given as:

Assuming a single tone message signal as:

The DSB-SC signal can be written as:

∴ The output of balanced modulator contains the modulation frequency, LSB and USB.

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